Absorption Spectrum of Ba I in the Region of Autoionization from 2382 to 1700 Å

Abstract

The atomic absorption cross section of barium has been measured in the autoionization region at an instrumental bandwidth of 0.075 \AA{} between 2380 and 2100 \AA{} and 0.75 \AA{} between 2100 and 1700 \AA{}. The cross sections of the absorption features whose half-widths approach the bandwidth of the monochromator have been corrected to eliminate the bandwidth dependence. The observed structure is grouped into series and presented with measured wavelengths and a parameter $F$. The latter is numerically equal to the oscillator strength of the transition, except when significant perturbations from neighboring lines or the underlying continuum occur. Evidence of the presence of elements in the series $6pns^{1}P_{1}$ and $^{3}P_{1} (ng6)$ is presented.